ruby-test.rb

# Number 1

input = %w[therapy fun is]
string = 'therapyisfunfunfunfunis'
input.each { |k| string.gsub!(k, " #{k} ") }
string.split.join(' ')


# Number 2
# Same solution as 1

input = %w[hello world good bye]
string = 'worldgoodgoodbye'
input.each { |k| string.gsub!(k, " #{k} ") }
string.split.join(' ')

# Number 3, even possible? 
input = %w[foo bar baz the therapy]
string = "oofrabzabtherapy"

# Produce the output of
"oofrabzab therapy"